Ventilator.



K. GRAEF.

VENTILATOR.

APPLICATION FILED JUNE 18, 1913.

-1,(: )86,1 60. Patented Feb. 3, 1914.

WITNESSES Mm ATTORNEY COLUMBIA PLANOGIAPH CO-IWASNINOTON. D. C'-

KARL GRAEF, OF BELLEVUE, PENNSYLVANIA.

I VENTILA'IOR.

Application filed June 18, 1913.

To all whom it may concern:

Be it known that I, KARL GRAEF, a citizen of the United States ofAmerica, residing at Bellevue, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inVentilators, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention relates to a ventilator, and the primary object ofnay-invention is to provide a ventilator that can be used asa sky-lightin connection with a roof, the ventilator admitting light and air andeX- cluding the forces of nature.

Another object of this invention is to pro vide a ventilator embodyingsuperimposed shells that can be easily and quickly adjusted to providean air exhaust.

A still further object of this invention is to provide a sky-lightventilator consisting of comparatively few parts that are easy toassemble, durable, inexpensive to manufacture, and easy to install inconnection with a roof.

With the above and other objects in View the invention resides in thenovel construction, combination and arrangement of parts to behereinafter specifically described and then claimed.

Reference will now be had to the drawing,

.. wh erein Figure 1 is a longitudinal sectional view of awentilator inaccordance with this invention. Fig. 2 is a cross sectional view of thesame. Fig. 3 is a plan of a portion of the ventilator, and Fig. 4 is anenlarged elevation of a portion of the ventilator.

A ventilator in accordance with this invention comprises a stationaryrectangular shell 1 having a lateral flange 2 whereby said shell can beeasily mounted upon a roof over a ventilating opening. The shell 1 hasinclined walls 3 terminating in a vertical flange 4. Secured to theinner sides of the flange 4 are diametrically opposed hangers 5 havingbearings 6, 7 and 8. Revolubly mounted in the bearings 6 and 7 arevertically disposed screws 9 and the lower ends of said screws areprovided with beveled gear Specification of Letters Patent.

Patented Feb. 3, 1914.

Serial No. 774,322.

wheels 10 meshing with beveled gear wheels 11 mounted upon a transverseshaft 12, journaled in the bearings 8. An end of the shaft 12 isprovided with a grooved wheel 13 and a chain, cable or cord can be usedin connection with this wheel for revolving the same.

Adjustably mounted upon the screws 9 are nuts 14 provided with pins 15.Loosely mounted upon the pins 15 are the slotted ends 16 of fulcrumedlevers 17. The levers 17 are disposed at an angle and are fulcrumed uponpins 18 carried by brackets 19,

secured to the flange 4. The outer ends of the levers 17 are pivotallyconnected, as at 20 to sets of arms 21 and 22. The sets of arms 21 arepivotally connected, as at 23 to an intermediate superimposed shell 24that is very similar to the shell 1. The only difference is that theflange 2 is dispensed with. The sets of arms 22 are pivotally connected,as at 25 to a top shell 26 and this top shell is similar in constructionto the shell 24, with the exception that said shell supports atransparent top plate 27.

By rotating the shaft 12 the nuts 14 can be raised and lowered upon thescrews 9 and consequently the levers 17 are moved to simultaneouslyadjust the shells 24 and 26 relatively to the stationary shell 1. v

It is thought that the operation and utility of the ventilator will beapparent without further description, and while in the drawing there isillustrated a preferred embodiment of the invention, it is to beunderstood that the structural elements are susceptible to suchvariations and modifications as fall within the scope of the appendedclaims.

What I claim is 1. An operating mechanism for the shiftable elements ofventilators comprising an operating shaft, a pair of rotatable threadedmembers actuated from said shaft, vertically movable members engagingwith and shifted by said threaded members, and elevating and loweringdevices connected to and operated by said ventilating movable members.

2. An operating mechanism for the shiftable elements of ventilatorscomprising an operating shaft, a pair of rotatable threaded ing actuatedby its respective nut when the members, gear connections between saidlatter is shifted by its respective member. 10 shaft and said membersfor operating these In testimony whereof I affix my signature lattersimultaneously, vertically movable in the presence of two witnesses.

nuts engaging with and shifted by said KARL GRAEF. members, andelevating and lowering delVitnesses:

vices each including a pair of pivoted levers MAX H. Snonovlrz looselyconnected to a nut and capable of be- KATHERINE ERRETT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. 0.

